Final answer:
The Zimbardo Research study discovered that respondents are more likely to mistake objects as guns when associated with blackness.The study showed how complete investment in role-playing can transform behavior and perceptions. The experiment was halted due to the rapid escalation of abuse and cruelty from the guards.
Step-by-step explanation:
The research study that discovered that when associated with blackness, respondents are more likely to mistake objects as guns is The Zimbardo Research. In Philip Zimbardo's experiment at Stanford University in 1971, participants were randomly assigned to play the roles of either prisoners or guards. The study showed how complete investment in role-playing can transform behavior and perceptions. The experiment was halted due to the rapid escalation of abuse and cruelty from the guards.